Municipal bus lines are keeping spare busses so some can always be charging. And the batteries need to be kept warm (for range) so busses are getting five gallo

Municipal bus lines are keeping spare busses so some can always be charging. And the batteries need to be kept warm (for range) so busses are getting five gallon diesel tank and small diesel engine to warm the coolant which is piped around the batteries. On a fixed route where one organization owns the place, the sane solution is overhead electric cables.